code: def test_betas(self):
      for beta_start, beta_end in zip(
          [0.0001, 0.001, 0.01, 0.1], [0.002, 0.02, 0.2, 2]
      ):
          self.check_over_configs(
              time_step=self.default_valid_timestep,
              beta_start=beta_start,
              beta_end=beta_end,
          )
  
imports: import tempfile
  from typing import Dict, List, Tuple
  import torch
  from diffusers import LCMScheduler
  from diffusers.utils.testing_utils import torch_device
  from .test_schedulers import SchedulerCommonTest
label_desc: Use image node_id 4 for calling the LCMSchedulerTest obj's underlying member method code with example usage: obj.test_betas() without return types